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Enviroment friendly utilization of fly ash for Geopolymers

Enviroment friendly utilization of fly ash for Geopolymers. IPW 2010 J. Hoppe, M. Tschamani, J. Petermann, M. Rohmann Lecturer: Dr. Gábor Mucsi. contents. 1 INTRODUCTION 2 CIRCUMSTANCES 3 FLOWSHEET OF PLANT 4 MACHINES

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Enviroment friendly utilization of fly ash for Geopolymers

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  1. Enviroment friendly utilization of fly ashfor Geopolymers IPW 2010 J. Hoppe, M. Tschamani, J. Petermann, M. Rohmann Lecturer: Dr. Gábor Mucsi

  2. contents • 1 INTRODUCTION • 2 CIRCUMSTANCES • 3 FLOWSHEET OF PLANT • 4 MACHINES • 5 APPLICATIONS

  3. 1 INTRODUCTIONproblems of fly ash • Present production rate of fly ash • In the United States about 131 million tons of fly ash are produced annually • 125 mio t/year in the EU, 300 mio t/year China+India • Groundwater contamination • Spills of bulk storage • Landfilling

  4. 1 INTRODUCTIONpossible applications • Portland cement • can replace up to 30% by mass of Portland cement • can add to the concrete’s final strength and increase its chemical resistance and durability • Only class C ash (contains more than 20% lime , does not require an activator ) • Geopolymers

  5. Geopolymers • The reacting product consists of SiO4 and AlO4 tetrahedrons (network) • Can be made from natural sources of pozzolanic material such as fly ash (class F fly ash) • Resistant to chemicals • Rapid-hardening with high strenghts • High density • Temperature stable • Ecological construction material (pozzolanic = A pozzolan is a siliceous or siliceous / aluminous material that, when mixed with lime and water, forms a cementitious compound )

  6. 1 INTRODUCTIONaim of the project • Ethical • Economical • Save the raw materials • Substitute landfilling by utilization • Save energy • Reduce CO2 Emissions Save the environment Sustainable development

  7. 2 CIRCUMSTANCES • Q= 75000 tons/year • Plant works 8 h/day and 230 days/year • Q= 41 t/h • ρ=0,9 kg/ dm3

  8. Feed 3 Flow sheet Q = 41 t/h Geopolymer Screening 2,5 t/h > 5 mm 38,5 t/h Drying 9,5 t/h n = 25% 29 t/h Grinding > 45 µm Air classifier 29 t/h Buffering

  9. Forming,Compacting Activator (NaOH/KOH) additives Mixing Ageing Heat treatment Cooling Final product

  10. 4 Machines • Screening • Zemmler STDT 4200 • Througput: 20-150 m3/h • Fine fraction: 2 – 80 mm

  11. 4 Machines • Holo-flite-dryer • Metso Q3028 • Length: 6 m • Heating: use of waste heat

  12. 4 Machines • Ball mill • Zhengzhou M 3645 • X80 < 40µm • Througput: 29 – 65 t/h • Motor power: 1250 kW

  13. 4 Machines • Air classifier • Througput: 40t/h • Fine fraction > 45µm

  14. 4 Machines • Mixer • Filling quantity Mixer (loose aggregates): 9600 kg • Drive power: 160 kW • Througput: 29 t/h need 7 mixer

  15. 5 Application of final material

  16. 5 Application of final material

  17. Thank you for your attention

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